Mention Python bytes object

Author: dargilco

articles/ai-services/computer-vision/includes/how-to-guides/analyze-image-40-python.md

@@ -43,7 +43,7 @@ You can use the following sample image URL.
 
 ### Image buffer
 
-Alternatively, you can pass in the image as a data array. For example, read from a local image file you want to analyze.
+Alternatively, you can pass in the image as [bytes](https://docs.python.org/3/library/stdtypes.html#bytes-objects) object. For example, read from a local image file you want to analyze.
 
 [!code-python[](~/cognitive-services-quickstart-code/python/ComputerVision/4-0/how-to.py?name=snippet_file)]